The American army
Since its creation by resolution of the Continental Congress on June 14, 1775 – more than a year before the declaration of independence – the United States military has played a key role in the growth, development and defense of the nation.
The army is one of the three military departments of the Ministry of Defense. The largest branch of the military, the mission of the US military is “to fight and win [the] nation wars, ensuring rapid and sustained land domination, across the gamut of military operations and the spectrum of conflict, in support of combatant commanders. The branch participates in conflicts around the world and is the primary land offensive and defensive force in the United States, according to Wikipedia.
The US Marine Corps is the service arm of the Maritime Land Forces of the armed forces. It is responsible for conducting expeditionary and amphibious operations using combined arms, implementing its own infantry, armor, artillery, air and special operations forces.
The branch dates back to Nov. 10, 1775, when two battalions of Continental Marines were formed in Philadelphia, capable of fighting both at sea and on land, according to Wikipedia.
The US Navy is the maritime service branch of the armed forces and is the largest and most powerful navy in the world, according to Wikipedia. The US Navy is the third largest branch of military service in the United States in terms of personnel. It has 290 deployable combat ships and more than 3,700 operational aircraft as of June 2019.
The 21st century US Navy maintains a significant global presence, deploying in force to areas such as the Western Pacific, Mediterranean, and Indian Ocean.
US Air Force
The US Air Force is the air service branch of the United States armed forces. Originally formed as part of the Army in 1907, the Air Force was established as a separate branch of the armed forces on September 18, 1947. It is the second youngest branch of the United States armed forces and lists its main missions such as air superiority, integrated global intelligence, surveillance and reconnaissance, rapid global mobility, global strike and command and control, according to Wikipedia.
US Coast Guard
The United States Coast Guard is the maritime security, search and rescue, and law enforcement branch of the armed forces. Its multi-mission service is unique among U.S. military branches to have a maritime law enforcement mission with jurisdiction in national and international waters and a federal regulatory agency mission as part of its duties, according to Wikipedia.
Established by the United States Congress on August 4, 1790, at the behest of Alexander Hamilton, the Coast Guard maintains a large fleet of coastal and ocean patrol vessels, dinghies, tugs, icebreakers and small boats, as well as an aeronautics division made up of helicopters and fixed-wing aircraft.
Air National Guard
The Air National Guard is a federal military reserve force of the US Air Force, as well as the air militia of the states and territories of the country, according to Wikipedia.
When Air National Guard units operate under the direction of state governors, they fulfill their militia role. However, if federated by presidential order, the units become an active part of the US Air Force.
Army National Guard
The Army National Guard, in conjunction with the Air National Guard, is an organized militia force and Federal Military Reserve force of the United States Army, according to Wikipedia. The Army National Guard is divided into subordinate units stationed in every state and territory of the United States, as well as the District of Columbia, operating under their respective governors and equivalents, the website notes.
It has a unique dual mission: to protect national communities at the state level and to support active-duty military forces in their response to overseas threats and humanitarian disasters.